<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>分类管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <el-alert
        title="添加商品信息"
        type="info"
        show-icon
        center
        :closable="false"
      ></el-alert>
      <!-- 步骤条 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="基本参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏 -->
      <el-form
        :model="addForm"
        :rules="addRules"
        ref="AddFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          :tab-position="'left'"
          v-model="activeIndex"
          :before-leave="beforeTabLeave"
          @tab-click="tabClick"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
              >
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="基本参数" name="1">
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="val" v-for="(val ,i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action 图片要上传的api地址 -->
            <el-upload
              action="http://127.0.0.1:8888/api/private/v1/upload"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编译器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
          <!-- 添加商品 -->
           <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片展示 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewDialogVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data() {
    return {
      //步骤条被激活的索引
      activeIndex: "0",
      //添加商品的表单对象
      addForm: {
        goods_name: "",
        goods_price: "",
        goods_weight: "",
        goods_number: "",
        goods_cat: [],
        //图片的数组
        pics:[],
        //商品详情
        goods_introduce:'',
        attrs:[],
      },
      //添加商品表单验证规则
      addRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" },
          {
            min: 1,
            max: 10,
            message: "长度在 1 到 10 个字符",
            trigger: "blur",
          },
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" },
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" },
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" },
        ],
        goods_cat: [
          { required: true, message: "请选择商品分类", trigger: "blur" },
        ],
      },
      cateList: [],
      cateProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      manyTableData: [],
      onlyTabData:[],
      //图片请求上传的headers请求头对象
      headerObj:{
        Authorization : window.sessionStorage.getItem('token')
      },
      previewPath:"",
      //图片预览的显示和展开
      previewDialogVisible:false,
      
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      //获取商品分类数据
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200)
        return this.$message.error("获取商品分类失败");
      this.cateList = res.data;
    },
    //级联选择器选择项变化
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat.length = [];
      }
    },
    //监听tabs标签切换事件
    beforeTabLeave(activename, oldActivename) {
      if (oldActivename === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请选择商品分类");
        return false;
      }
    },
    //点击tabs标签
    async tabClick() {
      //证明访问的是动态参数面板
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: "many" } }
        );
        if (res.meta.status !== 200)
          return this.$message.error("获取商品参数失败");
        res.data.forEach((item) => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(" ");
        });
        this.manyTableData = res.data;
      } else if(this.activeIndex === "2"){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel : "only"}});
        if(res.meta.status !== 200) return this.$message.error('获取静态属性失败');
        this.onlyTabData = res.data;
      }
    },
    //处理图片预览效果
    handlePreview(file){
      this.previewPath = file.response.data.url;
      this.previewDialogVisible = true;

    },
    //处理移除图片的操作  
    handleRemove(file){
      ///获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path;
      //从pic数组中，找到这个图片的索引
      const i = this.addForm.pics.findIndex(x => x.pic === filePath);
      this.addForm.pics.splice(i,1);
    },
    //监听图片上传成功
    handleSuccess(response){
      //拼接得到图片信息对象
      const picInfo = {pic:response.data.tmp_path};
      this.addForm.pics.push(picInfo);
    },
    //添加商品
    add(){
      this.$refs.AddFormRef.validate( async valid => {
        if(!valid) return this.$message.error('请填写必要的表单项');
        const form = _.cloneDeep(this.addForm);
        form.goods_cat =  form.goods_cat.join(',');
        //处理动态参数和静态属性
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id:item.attr_id,
            attr_value:item.attr_vals.join(' ')
          };
          this.addForm.attrs.push(newInfo);
        })
        this.onlyTabData.forEach(item => {
            const newInfo = {
              attr_id:item.attr_id,
              attr_value:item.attr_vals
            };
            this.addForm.attrs.push(newInfo);
          })
          form.attrs = this.addForm.attrs;
        const {data:res} = await this.$http.post('goods',form);
        console.log(res);
        this.$message.success('添加商品成功');
        this.$router.push('/goods');
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    },
  },
};
</script>

<style lang="less" scoped>
  .el-checkbox{
    margin:  0 5px 0 0 !important;
  }
  .previewImg{
    width: 100%;
  }
  .btnAdd{
    margin-top: 15px;
  }
</style>